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In high power applications, parallel-operated T-type three-level PWM rectifiers have been employed to overcome the power limitation of single rectifier and achieve a flexible operation with improved efficiency. However, zero sequence circulating current (ZSCC) problem emerges when rectifiers are directly parallel-connected in both ac and dc sides. In this paper, the circulating current problem in...
In recent years, direct current power (DC) supply systems have been applied in various types of industrial equipment. As a common practice, an alternating current(AC)/DC converter will be introduced at the system front end to convert mains into DC power sources for system operation. However, when connecting to a power grid, under the influence of load-end characteristics, the phase difference between...
Single-phase 3-level neutral point clamped cascaded rectifier (3LNPC-CR) has been successfully made its way into a traction drive system as a high-voltage traction converter. In this passage, the control issue of the 3LNPC-CR is considered. A transient current control strategy, combined with PI-based controllers, is adopted to achieve unity power factor, satisfactory sinusoidal grid current, regulated...
This paper deals with attractive voltage-source single-ended sub-resonant HF inverter as a simple wireless power transfer (WPT) based on unidirectional IPT in addition to Dual Active HF inverter and HF rectifier as transmitter and receiver of WPT is developed for bidirectional EV2H smart energy management architecture. Firstly, the voltage source single-ended sub-resonant HF inverter using a single...
This paper proposes the class-E rectifier with harmonic-current injection. For injecting the harmonic current, a harmonic-component resonant circuit is added to the class-E rectifier. By injecting the harmonic current with proper amplitude and phase, the peak value of the diode voltage and current can be reduced effectively. This paper shows the design example along with the experimental results....
A novel hybrid resonant zero-voltage zero-current switching PWM full-bridge converter with capacitive output filter is proposed in this paper. The hybrid resonant converter, with two full-bridge cells sharing a bridge leg and connecting the secondary windings of two transformers in series, operates in discontinuous current mode and can achieve zero-current switching for main power switches and rectifier...
The PWM half-bridge zeta (HBZ) converter is one of the most attractive dc-dc converters for wide-input-voltage applications due to its extended duty ratio above 0.5 and soft switching capability. However, it suffers from large peak current stress in the primary and secondary devices. To relieve these drawbacks, a PWM resonant HBZ converter is proposed. The proposed converter can effectively reduce...
A zero-voltage-switching (ZVS) bridgeless power factor correction (PFC) boost converter to reduce switching losses is proposed in this paper. Based on the conventional dual boost bridgeless converter, an auxiliary circuit including another main switch on the opposite side is added in the proposed converter to perform ZVS in man switches. Moreover, ZCS of auxiliary switches can also be achieved. As...
Based on the Cockcroft-Walton (CW) voltage multiplier, a novel receiver topology for IPT (Inductive Power Transfer) system is proposed. The proposed receiver topology enhances the efficiency of the IPT system through achieving that the induced secondary voltage and current are in-phase with the appropriate control method. This paper carried on the modeling of the receiver topology, and deduced the...
The maximum efficiency point tracking (MEPT) control strategy has been adopted in state-of-the-art wireless power transfer (WPT) systems to meet power demand with the highest efficiency against coupling and load variations. Most of the MEPT implementations use dc/dc converters to regulate the output voltage and maximize the efficiency at the expense of increased system complexity. Other implementations...
Current source rectifier with high switching frequency has a great potential for improving the power efficiency and power density in ac-dc power conversion. This paper analyzes the stability of direct current control based on the time delay effect. Small signal model including dynamic behaviors of dc link is developed to identify the control plants of grid ac current control and dc current control...
A novel Taiwan Tech Multi-Level Converter (TMC) is proposed for high-voltage input power conversion applications. A basic two-level circuit is obtained by modifying the conventional half-bridge converter with a dual-primary transformer and a clamping capacitor. By stacking N multi-level cells (MLC, each with two capacitors and two series switches) inserted into two-level circuit, consequently, a desired...
This paper proposes a simple circuit configuration and a control strategy of Solid-State Transformer (SST). In the proposed circuit, it is possible to reduce the volume of heat sinks and passive components by using low voltage switching device with low loss characteristic and high frequency operation. Moreover, the circuit employed with the proposed control strategy operates stably even when the ripple...
A highly integrated monolithic isolated gate driver with on-chip transformer is proposed. The main idea is to have an on-chip high-frequency voltage controlled oscillator (VCO) to provide a GHz carrier. Therefore, the on-chip transformer size could be shrunken to dimensions less than 1 mm2. Two on-chip transformer test structures are presented with dimension of 1020 µm × 860 µm. The stacked transformer...
This paper proposes the novel isolated capacitive power transfer outlet socket and plug using comb type capacitor. The detachable comb capacitor is proposed as a power supply connector. The target power at the first stage is decided as 100W. At first, optimization of structure and material of capacitive connectors is investigated in order to realize easy attachment and detachment. After consideration,...
Conventional 12-pulse diode rectifiers have advantages such as: simplicity, high reliability, and low DC bus voltage ripple; however, they also result in some disadvantages including harmonic current and the lack of re-generation capability. Therefore, this study proposes an auxiliary converter (AXC) for 12-pulse diode rectifiers to mitigate the harmonic current and provide re-generation capability...
The harmonic performance of the slim dc-link adjustable speed drives has shown good performance in some studies but poor in some others. The contradiction indicates that a feasible theoretical analysis is still lacking to characterize the harmonic distortion for the slim dc-link drive. Considering the shortcomings of the present harmonic analysis methods, such as the time-domain simulation, or the...
A DC-DC converter for high-power battery chargers with the power-capacity over 6.6-kW for electric vehicle (EV) is proposed in this paper. Due to a new architecture, the proposed converter achieves the reduction of conduction loss at the primary-side by as much as 50% and has many benefits such as reduced circulating current, less duty-cycle loss, and lower secondary-voltage stress. In addition, its...
This paper first discusses control loop characteristics for the PWM rectifier and the inverter used in an on-line UPS system. Then a unified control scheme for both the PWM rectifier and the inverter in the UPS system is investigated using single phase control in ABC frame. Based on the unified control scheme, a generic control kernel is defined. This generic control kernel is used to realize the...
Modular Multi-level Converter (MMC) has been widely researched in order to apply it for the back-to-back (BTB) high voltage direct current (HVDC) system. This paper proposes a new pre-charging scheme for the sub-module capacitors of MMC that is operated in nearest level control (NLC) modulation. The proposed scheme does not require any additional circuit or pulse width modulation (PWM) technique....
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